Oil cooler



Dec. 23, 1941. x. sp ss 2,267,423

I OIL COOLER Filed 001:. 4, 1938 35 as M i A M In van for MM A torn y;

Patented 23, V

OIL COOLER Franz X. Reimspiess, Stuttgart, Germany, assignor to Dr. ing. 11. c. F. Porsche, K.-G., Stuttgart-Zuffenhausen, Germany, a company of Germany 1 Application October 4, 1938, Serial No. 233,214

Germany October 6, 1937 removedtherewith, thus facilitating access to 4 Claims.

This invention relates to oil coolers and particularly to th arrangement of oil coolers associated with internal combustion engines of the type cooled by blowers.

In the case of high speed internal combustion engines operating for long periods under full load as occurs frequently in automotive service, the lubricating oil is depended upon to carry away some of the heat of the engine, especially in the case of air cooled engines in which a considerable part of the heat is developed at points the underlying parts. I

Other objects will appear from the following description of an illustrative'embodiment of the invention taken together with the attached drawing which shows in vertical section one form of the invention as applied to an opposed engine.

In said drawing, the numeral i represents the' usual crank case provided with crank shaft 2 not readily accessible to the current of the cooling medium, such as air. As will be readily un derstood, it becomes necessary in such cases to.

provide for proper cooling of the lubricating fluid.

It is an object of this invention to avoid the disadvantages of prior constructions by dividing the stream of cooling air into several partial air streams, one of which is passed through the oil cooler.

Another object is to provide sucha construc tion in which one of said air streams is passed through the oil cooler and also into contact with a part of the engine to be cooled.

Another object is to provide a construction having minimum air resistance and minimum eddy currents so that the various engine parts may be effectively and reliably cooled.

The division of the cooling air current has the result that a separate current may be supplied for each-cylinder or each group of cylinders.

Another object is to so divide the air stream that a single cylinder or a cylinder group may be divided into several separate zones, each cooled by an individual air stream.

Another object is to divide the air stream into several individual streams, some of which are,

directed to cool certain engine parts and another, appropriately enlarged, airstream is directed to cool the oil cooler and also certain other parts of the engine.

Another object is to provide a construction having minimum air resistance and maximum certainty of air flow so that all parts will be reliably cooled.

Another object is to provide a construction in which the various air stream guiding members may be easily removed for exposing and giving and carrying the two cylinders 3 and 4 whose cylinder heads are designated as 5 and 6, re-

spectively. Above the crank case I isjournaled the blower wheel"! whose shaft 8 is driven from the crank shaft 2 by any suitable means. The

guiding surface formed comprising the guiding vanes 9, ID, and II divides the cooling air stream into three partial air streams l2, l3, and H. The partial air streams l2' and [3, as shown, pertain to the left cylinder 3, 5, and "the partial air stream it pertains to the right cylinder 4, 6. In the partial air stream I2 lies. the oil cooler I5 and thereafter the cylinder 3 to be cooled.

The head l6 of the oil cooler is preferably covered by a directing vane 9. The foot I! of the oil cooler is joined to the guiding vane in such a manner as to minimize the air resistance. The

and directing the air streams so that upon removal of the casing said attached means will be sides l8 and IQ of the head IBand the foot I! face the cooling air current and are formed in accordance with the laws of streamlining. The partial air current l2, after flowing through the oil'cooler I5, is preferably divided by means of the guiding vane 20 into the partial air streams 2| and 22. The partial air stream 2| cools the relatively lightly heated cylinder 3, the air stream 22 joining with the partial air current l3 and together they cool the cylinder head 5 which must be especially well cooled. Due to the distribution of the guide vanes Ill and II around the circumference of the blower wheel I,

the left cylinder 3, 5, in whose cooling air current the oil cooler lies, receives considerably more cooling air than is supplied then to the right cylinder l, 6. The cooler I5 is fastened down upon an extension of the crank case by means of its foot IT. The connection of the oil inlet conductor 26 and the oil outlet conductor 25 preferably is effected through the attaching surface 26. The cover 21 surrounding the entire air cooling device is separate from the guide vanes '28 and 29 which are attached to the cylinders and it is connected therewith only by screws 10 and 3| so that it can befreadily taken off; the guiding vanes 9, l0 and 2B are firmly interconnected with the cover 21 so that they will be of a compactly built oil cooler which can be produced with less expense and lower weight, but also permits the provision, at low cost. of a blower for readily cooling the motor with the least amount of driving power. Insertion and tak ing'out of the oil coolers is easy and quick. It is completely protected it needs no additional space; and does not hinder the accessibility of the other parts of the internal combustion engine.

This invention is usable with Diesel and other engines'as well as with intermediate forms. The invention is applicable equally for in-line, radial, and opposed engines. For this reason duplicating is possible as, for'example, two or more oil coolers, or in special cases, several blowers may be used. The special formation of the oil cooler is unimportant. It can, for example, be made as a tubed or webbed cooler and its head can be open up the oil cooler for testing and possible exchange.

It will be noted that the construction shown and described will serve admirably t'o accomplish the objects stated above. It is to be understood, however, that the construction disclosed above is intended merely as illustrative of the invention and not as limiting as various modifications therein may be made without departing from the invention as defined by a proper interpretation of the claims which follow.

I claim:

1. In an air-cooled internal combustion engine including a plurality of cylinders and a power shaft, a blower driven by said power shaft, an oil cooler, a plurality of delivery ducts leading from said blower, one of which delivers cooling air to a cylinder and another of which delivers cooling air to said oil cooler and thereafter to another cylinder, and third duct which delivers air directly to said second-mentioned cylinder, said duct being so positioned relatively to said blower and so dimensioned that the second and after to another cylinder, the said ducts being so positioned relatively to said blower and so dimensioned that the amount of air delivered to each oi said cylinders is such that each of saidv cylinders receives the same amount of cooling, despite the inclusion of the oil cooler in the other duct.

3. In an air-cooled internal combustion engine including a plurality of opposed horizontal delivery ducts lying in the plane of rotation of third ducts together receive more'air from the blower than said first duct, whereby the total cooling effect from said air upon both cylinders is substantially the same despite the inclusion of the oil cooler in the second duct.

said blower leading from said blower, one of which ducts delivers cooling air directly to a cylinder downwardly upon said cylinder, and another of which delivers cooling air to said oil cooler and thereafter to another cylinder downwardly upon said second cylinder, said ducts being so positioned relatively to said blower and so dimensioned that the one delivery duct receives less air and the other more air from the blower, whereby the total cooling effect from said air upon both cylinders is substantially the same, despite the inclusion of the oil cooler in said other duct.

4. In an air-cooledinternal combustion engine including a plurality of opposed horizontal cylinders extending oppositely from a crank case, and being provided with radially extending annular cooling fins, and a power shaft in said crank case, a blower located above said cylinders and driven by said power shaft, an oil cooler, a plurality of delivery ducts lying in the plane of rotation of said blower leading from said blower, one of which ducts delivers cooling air to a cylinder downwardly thereupon and between its cooling fins, and another of which delivers cooling air to said oil cooler and thereafter to another cylinder downwardly thereupon and between its cooling fins, and a third duct which delivers air directly to said second-mentioned cylinder downwardly thereupon and between other of its cooling fins, said ducts being so positioned relatively to said blower and so dimensioned that the second and third ducts together receive more air from the blower than said first duct, whereby the total cooling eifect from said air upon both cylinders is substantially the same despite the inclusion of the oil cooler in the second duct.

FRANZ X. REIMSPIESS. 

